Understanding the Concepts
* pH: A measure of the acidity or alkalinity of a solution. A lower pH indicates a more acidic solution.
* HCl (Hydrochloric Acid): A strong acid, meaning it completely ionizes in water. This means that 1 mole of HCl will produce 1 mole of H+ ions.
* Concentration: The amount of a substance dissolved in a given volume of solution.
Calculations
1. Calculate the concentration of H+ ions:
Since HCl is a strong acid, [H+]= [HCl] = 0.002 M
2. Calculate the pH:
pH = -log[H+]
pH = -log(0.002)
pH = 2.70
Answer: The pH of 200 mL of 0.002 M HCl is approximately 2.70.
